Added bootstrap component via bower

This will make updates easier
Added bootstrap SASS 2.3.1

Perhaps it might be a better idea to use bower, but adding these files
makes every other developer be able to build the site without bower, and
that is good.
Let sprockets find bootstrap and other assets.
Modifications to use bootstrap

Main modifications go in the template to use the sass bootstrap and
change variables around.
Fixes blog styling

It fixes almost all responsive problems.